That would be the first step that we would hope an employee would follow, so if they thought there might be something wrong, they would first talk to their supervisor and say, “I'm concerned about something”. In many cases it can be dealt with there and then. It could be miscommunication or that they're not aware of all of the information around something that's going on, and it can be taken care of then.
If it's not, then they could say, “I think there really is a problem here”, and it could be a formal disclosure to their supervisor, or their supervisor could tell them then that they have the option to go to the senior officer in the department, or to the commissioner if they prefer. It's completely the choice of the employee.
They would be asked to specify what their concern was clearly enough so that the senior officer could investigate and ask questions within the organization about the concern they had.